cat5 or 5e is the quality of the cable. Quality in the way of speed, not in product. cat5 is OK for home use http://donutey.com/ethernet.php No extra software needed. Plug & play. But i advice you to buy a switch. http://en.wikipedia.org/wiki/Proxyserver 100 meter is no problem. I don't understand what you say. I have 4 switches in use. Switches for home use and not pro-stuff. http://en.wikipedia.org/wiki/Network_switch I have a 5-port switch of Dlink: this 8-ports GB-switch of Dlink: this Dlink with cable and wireless: and a 3com switch. All these switches gives a lot of heat and maybe your friend have put them in a case with fans? Or do you mean the switches like these: They are in a case.